Tumble stone sizes generally range from 1 - 3cm
Bumble Bee Jasper Tumble Stone
Bumble Bee Jasper is a strong earth energy stone, that embodies within it the strong energy of the volcano from which it was birthed. It is an unusual stone that was formed where a volcano opened to the earth. These stones stimulate both the sacral and solar plexus chakras.
Bumble Bee Jasper is indeed on the "toxic" list because it contains sulfur and arsenic. Tumbled bumble bee jasper is safer to handle than raw, but it's best to always limit your exposure to "toxic" crystals and to always wash your hands after handling them.